execute pathogen#infect() an invalid expression?

[ldco2016]

I am in a Mac OS and I just added some scripts to get new functionality from my vim editor and when I go back into the vimrc file I continue to get this error:

vim ~/.vimrc
Error detected while processing /Users/danale/.vimrc:
line 12:
E117: Unknown function: pathogen#infect
E15: Invalid expression: pathogen#infect()

I have looked at similar posts here that are not very helpful. Ultimately, I would like to use nerdtree configuration so I can use VIM as my IDE.

[rcrx]

Is Pathogen in the right PATH?

[xbrotwo]

I have the same issue,because I use wget to download:
in pathogen.vim, it includes some html tags.
you can fix it on this way:
git clone https://github.com/tpope/vim-pathogen
cp /root/vim-pathogen/autoload/pathogen.vim /root/.vim/autoload/